title: NQO1 prevents radiation-induced aneuploidy by interacting with Aurora-A.
abstract: Aneuploidy is the most common characteristic of human cancer cells. It also causes genomic instability, which is involved in the initiation of cancer development. Various lines of evidence indicate that nicotinamide adenine dinucleotide(P)H quinone oxidoreductase 1 (NQO1) plays an important role in cancer prevention, but the molecular mechanisms underlying this effect have not yet been fully elucidated. Here, we report that ionizing radiation (IR) induces substantial aneuploidy and centrosome amplification in NQO1-deficient cancer cells, suggesting that NQO1 plays a crucial role in preventing aneuploidy. NQO1 deficiency markedly increased the protein stability of Aurora-A in irradiated cancer cells. Small interfering RNA targeting Aurora-A effectively attenuated IR-induced centrosome amplification concerned with aneuploidy in NQO1-deficient cancer cells. Furthermore, we found that NQO1 specifically binds to Aurora-A via competing with the microtubule-binding protein, TPX2 (targeting protein for Xklp2), and contributes to the degradation of Aurora-A. Our results collectively demonstrate that NQO1 plays a key role in suppressing IR-induced centrosome amplification and aneuploidy through a direct interaction with Aurora-A.
authors.affiliation: Department of Microbiology, Center for Advanced Medical Education by BK21 Project, College of Medicine, Inha University, Incheon 400-712, Republic of Korea.
authors.forename: Moon-Taek
authors.initials: MT
authors.lastname: Park
authors.forename: Eun-Taex
authors.initials: ET
authors.lastname: Oh
authors.forename: Min-Jeong
authors.initials: MJ
authors.lastname: Song
authors.forename: Hyemi
authors.initials: H
authors.lastname: Lee
authors.forename: Eun Kyung
authors.initials: EK
authors.lastname: Choi
authors.forename: Heon Joo
authors.initials: HJ
authors.lastname: Park
mesh_terms: D000782:Aneuploidy; D017209:Apoptosis / Q000528:radiation effects; D064096:Aurora Kinase A / Q000378:metabolism*; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000235:genetics / Q000473:pathology* / Q000532:radiotherapy; D002453:Cell Cycle / Q000528:radiation effects; D049109:Cell Proliferation / Q000528:radiation effects; D018385:Centrosome; D002588:Cesium Radioisotopes; D005260:Female; D005720:Gamma Rays; D006801:Humans; D047468:Immunoprecipitation; D016660:NAD(P)H Dehydrogenase (Quinone) / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000235:genetics; D014407:Tumor Cells, Cultured
chemical_list: D002588:Cesium Radioisotopes; D034741:RNA, Small Interfering; D016660:NAD(P)H Dehydrogenase (Quinone); C447479:NQO1 protein, human; D064096:Aurora Kinase A